feat(exceptions): implement examples of checked and unchecked exception handling

src/main/java/org/exceptions/FileService.java

@@ -0,0 +1,86 @@
+package org.exceptions;
+
+import java.io.BufferedReader;
+import java.io.BufferedWriter;
+import java.io.FileReader;
+import java.io.FileWriter;
+import java.text.SimpleDateFormat;
+import java.util.Date;
+import java.util.Scanner;
+
+public class FileService {
+
+
+    public static void main(String[] args) {
+
+        Scanner scanner = new Scanner(System.in);
+
+        System.out.println("Enter you first name: ");
+        String firstName = scanner.nextLine();
+
+        System.out.println("Enter you last name: ");
+        String lastName = scanner.nextLine();
+
+        System.out.println("Enter your national code: ");
+        Long nationalCode = scanner.nextLong();
+        scanner.nextLine();
+
+        System.out.println("Enter your email: ");
+        String email = scanner.nextLine();
+
+        System.out.println("Enter your phone number: ");
+        Long phoneNumber = scanner.nextLong();
+        scanner.nextLine();
+
+        System.out.println("Enter your dateOfBirth: ");
+        String dateOfBirth = scanner.nextLine();
+
+        UserEntity user = null;
+
+        user = new UserEntity(firstName, lastName, nationalCode, email, phoneNumber, parseDate(dateOfBirth));
+
+        System.out.println(user.toString());
+
+        System.out.println(writeFile(user));
+        readFile();
+
+
+    }
+
+
+    public static String writeFile(UserEntity user) {
+
+        FileWriter fw = new FileWriter("D:\\ExceptionHandling\\userInformation.txt", true);
+        BufferedWriter bw = new BufferedWriter(fw);
+
+        bw.write(user.toString());
+        bw.close();
+        return "user information written to file";
+    }
+
+
+    public static void readFile() {
+
+        FileReader file = new FileReader("D:\\ExceptionHandling\\userInformation.txt");
+
+        BufferedReader fileInput = new BufferedReader(file);
+
+        for (int counter = 0; counter < 3; counter++)
+            System.out.println(fileInput.readLine());
+
+        fileInput.close();
+    }
+
+
+    public static Date parseDate(String date) {
+        SimpleDateFormat formatter = new SimpleDateFormat("yyyy-MM-dd");
+
+        Date dob = null;
+
+        dob = formatter.parse(date);
+
+
+        return dob;
+    }
+
+}